Both BRAF- and KRAS-mutated carcinomas demonstrated more frequently mucinous differentiation when compared with BRAF- and KRAS- wild type carcinomas respectively (34.7% vs 24.8% and 69.6% vs 25.9%; P = 0.004 for KRAS-mutated carcinomas vs KRAS-wild type carcinomas; P < 0.0001 for BRAF-mutated carcinomas vs BRAF-wild type carcinomas). The gene discussed is KRAS; the disease is carcinoma.